Segment Information (Revenues, Cost Of Products And Services, And Gross Margins For Operating Segments) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Total revenues	$ 61,948	$ 45,059
Total cost of products and preservation services	22,720	15,547
Total gross margin	39,228	29,512
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	0
Operating Segments [Member] | Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	43,598	27,396
Total cost of products and preservation services	14,157	8,017
Total gross margin	29,441	19,379
Operating Segments [Member] | Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	18,350	17,663
Total cost of products and preservation services	8,563	7,530
Total gross margin	$ 9,787	$ 10,133